Help! Accidentally deleted my Windows 8 partition. Can I recover it?

I have a bit of a problem.
While I was trying deleting/formatting a USB stick connected to my rMBP, I accidentally selected the windows partition on my HDD instead of the USB. I then preceded to rename and click "erase," just before realising what I'd done!

As you can imagine, I was pretty annoyed with myself, but I hoped that I was mistaken and booting into windows would would work as normal... This didn't happen. Is there anything I can do to get back to 'the old days' and recover my Windows instalation/partition?

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